以南林895杨扦插苗为试验材料,用不同浓度的CaCl2溶液叶面喷施处理20 d后,研究扦插苗光合作用参数的变化及其生长情况。结果表明:(1)不同浓度外源Ca2+处理下扦插 苗净光合速率(Pn)、蒸腾速率(Tr)、气孔导度(Gs)、细胞间CO2浓度(Ci)均呈现先升高后下降的趋势。随着Ca2+浓度的升高,20 mg/L Ca2+处理下Ci值最大;但Pn、Tr、Gs在200 mg/L Ca2+处理下才达到最大值,且与对照差异性显著,分别比对照高22.34 %、57.76 %、105 %。(2)外源Ca2+处理可显著提高扦插苗株高和地径的生长量,与对照相比其差异性达 到显著或极显著水平,其中200 mg/L Ca2+处理对株高、地径的促进作用最为明显,分别比对照高25.74 %和70.15 %。说明适宜浓度的外源Ca2+可以改善杨树扦插苗光合作用状况, 从而有效地促进扦插苗的生长。
Abstract
Using Populus×euramericana Nanlin 895 cuttings as experimental materials, we investigated the effects of exogenous Ca2+ on its growth situations and photosynthetic parameters after foliarspraying at 20 days. The experimental results were that: (1)With the Ca2+ concentration increasing, the Pn, Tr, Gs, Ci in the leaf was presented gradually trends of increase first, and then decrease without exception. The value of Ci would reach to maximum when the concentration of Ca2+ treatment was 20 mg/L. However, the value of Pn, Tr, Gs would reach to the peak when the concentrations of exogenous Ca2+ was 200 mg/L. Compared with the control test, the difference was quite obvious, and it increased by 22.34 %, 57.76 %, 105 %, respectively. (2)The exogenous Ca2+ treatment could promote height of the plant and caliper growth of Populus×euramericana Nanlin 895 cuttings. The otherness was remarkable or extreme noticeable at the side of control test. Thereinto, the stimulative role of 200 mg/L Ca2+ treatment was the best one, and the height and caliper increased by 25.74 %, 70.15 %, separately. In a word, the proper concentration of exogenous Ca2+ treatment could improve the photosynthetic conditions. Consequently, the growth of Populus ×euramericana Nanlin 895cuttings were accelerated effectively.
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参考文献
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基金
收稿日期:2010-03-04修回日期:2010-07-01基金项目:国家自然科学基金项目(30671657)作者简介:王雷(1982—),硕士生。*尹增芳(通信作者),教授。 Email: zfyin@njfu.edu.cn。引文格式:王雷,尹增芳,马清滢,等. 外源Ca2+对南林895杨扦插苗光合作用及生长的影响[J].